What if you NEVER kiss the girl on the lips. Pull her, hold hands, grab her ass, kiss her neck, etc. and go straight for fingering. Kissing intimately releases oxytocin, serotonin, dopamine, endorphins, adrenaline. You know what else releases the same chemicals? Sex. So if you kiss her, you're giving her body what it is craving for. If you withhold kissing...there is only one way for her body to get her fix.